用未确知数学方法确定某坝址岩体变形参数

首先介绍了未确知信息理论的概念及其应用领域,指出了传统均值法处理数据存在的问题,对未确知信息数学处理方法和过程进行了简要说明.运用这一处理方法对黄河上游某电站坝址岩体变形模量的取值进行了论证,并对两种方法得到的结果进行了对比.结果表明这一方法在不确定性信息处理中比传统方法具有更多的优点,能够给出不同保证率下的岩体变形模量值,表明其处理数据更精细、更科学,值得在地质工程相关数据处理中进一步探讨和应用.     

含水量对昔格达土填料工程地质性质的影响研究

昔格达地层的沉积地质历史环境决定了昔格达地层的多旋回性及其中泥岩的近饱和特性 ,因此昔格达土填料具有一般其他岩土填料不一样的工程特征。本文通过对昔格达土工程特性的论述 ,以含水量为锲入点 ,分析了含水量变化对昔格达土填料工程性质的影响 ,得出昔格达土混合填料最大干密度 dmax、压实度及强度c、 值都与含水量存在一致的相关性 ,即存在一个最优含水量 ,这个最优含水量接近随机混合的昔格达填料的天然含水量的结论。     

基于电导性能的原状土柱降雨入渗规律研究

我国东南沿海地质环境复杂脆弱,由台风暴雨引发的滑坡频频发生.雨水入渗到土体内可能导致坡体变形,进而产生滑坡、泥石流等灾害.以福建三明岩兜滑坡为研究对象,通过自行研制的人工降雨土柱入渗试验装置,对研究区滑坡的残积土柱进行了不同降雨强度下(20 mm·h-1、60 mm·h-1)的累次循环降雨实验,考虑了不同降雨量、降雨历...     

建(构)筑物控制爆破拆除的仿真模拟

介绍了在ABAQUS有限元框架内,建（构）筑物爆破拆除仿真模拟的基本方法。提出了爆破缺口高度的确定方法、结构坍塌的力学判据与结构的离散化方法,利用ABAQUS有限元软件的非线性瞬态显式动力学模块模拟结构的失稳及倒塌过程,并用该方法对一个拆除爆破实例进行了仿真模拟。模拟结果表明,结构的坍塌过程及爆堆形状与实际接近。     

用矢量有限元方法模拟随钻测井仪在倾斜各向异性地层中的电磁响应

用矢量有限元法模拟和分析了电各向异性倾斜沉积岩层的随钻测井电磁响应,为很好地模拟钻铤、井眼和激励线圈等,采用了基于圆柱坐标下的六面体剖分;同时采用了高阶叠层矢量基函数来描述每个剖分单元内的场,有利于减少剖分单元数和未知量.三维有限元程序采用数值模式匹配(当处于简单地层时)以及时域有限差分法计算的结果进行了验证,显示吻合非常好.最后仿真了不同各向异性系数和不同倾角的各向异性地层的随钻电阻率测井响应,有助于对各向异性及地层倾角的校正,以及对储层作出正确评价.     

深基坑双排桩支护结构设计计算方法研究

考虑了土压力的空间效应,分析并计算了冠梁对双排桩支护结构的变形协调作用;考虑了滑移面和排距对作用在前后排桩上的土压力的影响,在弹性地基梁法的基础上,提出了一种新的双排桩支护结构设计计算模型。将理论计算结果与工程实测资料进行了对比分析,结果表明应用该计算模型进行计算,能得到有效的计算结果。     

煤层气近水平孔孔底水力封隔器设计与试验

通过近水平钻孔对高瓦斯煤田内煤层气实时原位探测,是提高煤层气抽放率和保证煤田开采安全的重要前提,而对孔底进行原位密封则是实现原位探测技术的关键。设计出了一种能方便快捷地实现孔底原位密封的水力封隔器,并通过了室内试验和现场应用。测试表明:密封胶筒的耐压力在有外围限制的情况下至少可达1 MPa,膨胀后的直径可达114 mm,对于Φ75 mm、Φ95 mm和Φ105 mm的煤层气钻孔完全适用。      

MAPGIS在地学制图上的应用

本文主要叙述ＭＡＰＧＩＳ在地学制图上的技术和方法,同时提出进一步提高地学图制图质量的措施和途径。     

矿产资源开发遥感监测技术问题与对策研究

根据目前国家对矿产资源开发状况，对矿山环境监督管理的现状及需求进行了分析，探讨了遥感技术在矿山开发状况和矿山环境监测方面的应用前景，指出大规模监测所面临的问题，并提出解决问题的思路，得出了遥感技术在该领域有较好的推广应用前景的结论。     

The Origin of the Proterozoic Bidjovagge Gold-Copper Deposit, Finnmark, Northern Norway, as Deduced from Rare Earth Element and Nd Isotopic Evidences on Calcites

Abstract: The Bidjovagge gold-copper deposit, northern Norway occurs in the lower Proterozoic Kautokeino greenstone belt, and consists of ten ore bodies in albite felsite, graphite schist and meta-diabase sills, along with a series of syenodiorite dykes. Calcite is one of the most important gangue minerals occurring within the ore veins. The early primary calcite samples from A, C and D ore bodies (copper–rich) show almost flat chondrite-normalised REE curves, and slightly positive Eu anomalies. A Sm-Nd isotope age of 1858 ± 72 Ma (2ρ) has been given based on fifteen primary calcite samples. The Sm-Nd age of calcite is in well agreement with previously published U-Pb davidite age of 1885 ±18 Ma (2ρ) and Sm-Nd davidite age of 1886 ± 88 Ma (2ρ). All these isotopic age data indicate that the gold-copper mineralisation may occur during or slightly after the peak of the Svecokarelian orogeny. Two late primary calcite samples from C and D ore bodies have flat chondrite-normalised LREE curves, positive HREE curves, and negative Eu anomalies. In contrast, most of the early primary calcite samples from B ore body (gold–rich) show an overall negative chondrite-normalised REE slope and negative Eu anomalies. Sm-Nd data on seven primary calcite samples from the B ore body are relatively scattered, and gave an isochrone age of 1809 ± 150 Ma (2ρ), identical to the age of the calcite samples from A, C and D ore bodies. Two late primary calcite samples from the B ore body have almost flat chondrite-normalised REE slope and negative Eu anomalies. REE patterns and eNd (T) values of calcites suggest that the ore fluids for the calcites from the A, C and D ore bodies derived their metals from mafic igneous rocks (diabase sills). For the secondary calcites from the C ore body, their relative high initial Nd (T) values at 1858 Ma imply that much more radiogenic Nd-component were incorporated during calcite crystallisation when another ore fluid emplaced. Combined Nd isotope data and REE geochemical features suggest that the isotopically more evolved source such as albite felsite and syn-genetic high level syenodiorite dykes were probably metal source for these calcites in the B ore body. Three samples of secondary calcite from the B ore body, which obviously deviated from 1809 Ma isochron are easily explained as products of post-ore hydrothermal events.